//无缝滚动
setInterval(function () {
  var ul = document.querySelector('section.hot ul')
  var ulLeft = parseInt(ul.style.marginLeft)
  ulLeft--
  if (ulLeft <= -2032) {
    ul.style.marginLeft = '0px'
  } else {
    ul.style.marginLeft = ulLeft + 'px'
  }
}, 10)